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1. Overview of the DESI Milky Way Survey

Author

Andrew P. Cooper, Sergey E. Koposov, Carlos Allende Prieto, Christopher J. Manser, Namitha Kizhuprakkat, Adam D. Myers, Arjun Dey, Boris T. Gänsicke, Ting S. Li, Constance Rockosi, Monica Valluri, Joan Najita, Alis Deason, Anand Raichoor, M.-Y. Wang, Y.-S. Ting, Bokyoung Kim, Andreia Carrillo, Wenting Wang, Leandro Beraldo e Silva, Jiwon Jesse Han, Jiani Ding, Miguel Sánchez-Conde, Jessica N. Aguilar, Steven Ahlen, Stephen Bailey, Vasily Belokurov, David Brooks, Katia Cunha, Kyle Dawson, Axel de la Macorra, Peter Doel, Daniel J. Eisenstein, Parker Fagrelius, Kevin Fanning, Andreu Font-Ribera, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Julien Guy, Klaus Honscheid, Robert Kehoe, Theodore Kisner, Anthony Kremin, Martin Landriau, Michael E. Levi, Paul Martini, Aaron M. Meisner, Ramon Miquel, John Moustakas, Jundan J. D. Nie, Nathalie Palanque-Delabrouille, Will J. Percival, Claire Poppett, Francisco Prada, Nabeel Rehemtulla, Edward Schlafly, David Schlegel, Michael Schubnell, Ray M. Sharples, Gregory Tarlé, Risa H. Wechsler, David H. Weinberg, Zhimin Zhou, Hu Zou, Cooper, AP [0000-0001-8274-158X], Koposov, SE [0000-0003-2644-135X], Allende Prieto, C [0000-0002-0084-572X], Manser, CJ [0000-0003-1543-5405], Dey, A [0000-0002-4928-4003], Gänsicke, BT [0000-0002-2761-3005], Li, TS [0000-0002-9110-6163], Rockosi, C [0000-0002-6667-7028], Valluri, M [0000-0002-6257-2341], Najita, J [0000-0002-5758-150X], Deason, A [0000-0001-6146-2645], Raichoor, A [0000-0001-5999-7923], Ting, YS [0000-0001-5082-9536], Kim, B [0000-0002-8999-1108], Carrillo, A [0000-0002-5786-0787], Beraldo e Silva, L [0000-0002-0740-1507], Han, JJ [0000-0002-6800-5778], Ding, J [0000-0003-4651-8510], Sánchez-Conde, M [0000-0002-3849-9164], Aguilar, JN [0000-0003-0822-452X], Ahlen, S [0000-0001-6098-7247], Bailey, S [0000-0003-4162-6619], Belokurov, V [0000-0002-0038-9584], Brooks, D [0000-0002-8458-5047], Cunha, K [0000-0001-6476-0576], Dawson, K [0000-0002-0553-3805], Eisenstein, DJ [0000-0002-2929-3121], Font-Ribera, A [0000-0002-3033-7312], Forero-Romero, JE [0000-0002-2890-3725], Gaztañaga, E [0000-0001-9632-0815], A Gontcho, SG [0000-0003-3142-233X], Guy, J [0000-0001-9822-6793], Kehoe, R [0000-0002-7101-697X], Kisner, T [0000-0003-3510-7134], Kremin, A [0000-0001-6356-7424], Landriau, M [0000-0003-1838-8528], Levi, ME [0000-0003-1887-1018], Martini, P [0000-0002-0194-4017], Meisner, AM [0000-0002-1125-7384], Miquel, R [0000-0002-6610-4836], Moustakas, J [0000-0002-2733-4559], Nie, JJD [0000-0001-6590-8122], Palanque-Delabrouille, N [0000-0003-3188-784X], Percival, WJ [0000-0002-0644-5727], Prada, F [0000-0001-7145-8674], Rehemtulla, N [0000-0002-5683-2389], Schlafly, E [0000-0002-3569-7421], Schlegel, D [0000-0002-5042-5088], Sharples, RM [0000-0003-3449-8583], Tarlé, G [0000-0003-1704-0781], Wechsler, RH [0000-0003-2229-011X], Weinberg, DH [0000-0001-7775-7261], Zhou, Z [0000-0002-4135-0977], Zou, H [0000-0002-6684-3997], Apollo - University of Cambridge Repository, HEP, INSPIRE, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and UAM. Departamento de Física Teórica

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Surveys (1671), Dwarf Galaxies (416), astro-ph.GA, FOS: Physical sciences, Milky Way Dark Matter Halo (1049), 5109 Space Sciences, Stellar Abundances (1577), Galaxy Formation (595), Milky Way Evolution (1052), Milky Way Galaxy (1054), Física, Astronomy and Astrophysics, Milky Way Stellar Halo (1060), Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), Radial Velocity (1332), astro-ph.CO, Milky Way Dynamics (1051), Spectroscopy (1558), Milky Way Galaxy Physics (1056), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], 51 Physical Sciences, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, los autores pertenecientes a la UAM y el nombre del grupo de colaboración, si lo hubiere, We describe the Milky Way Survey (MWS) that will be undertaken with the Dark Energy Spectroscopic Instrument (DESI) on the Mayall 4 m telescope at the Kitt Peak National Observatory. Over the next 5 yr DESI MWS will observe approximately seven million stars at Galactic latitudes ∣b∣ > 20°, with an inclusive target selection scheme focused on the thick disk and stellar halo. MWS will also include several high-completeness samples of rare stellar types, including white dwarfs, low-mass stars within 100 pc of the Sun, and horizontal branch stars. We summarize the potential of DESI to advance understanding of the Galactic structure and stellar evolution. We introduce the final definitions of the main MWS target classes and estimate the number of stars in each class that will be observed. We describe our pipelines for deriving radial velocities, atmospheric parameters, and chemical abundances. We use ≃500,000 spectra of unique stellar targets from the DESI Survey Validation program (SV) to demonstrate that our pipelines can measure radial velocities to ≃1 km s−1 and [Fe/H] accurate to ≃0.2 dex for typical stars in our main sample. We find the stellar parameter distributions from ≈100 deg2 of SV observations with ≳90% completeness on our main sample are in good agreement with expectations from mock catalogs and previous surveys, This equipment was funded by MoE, NSTC, and National Tsing Hua University. C.A.P. acknowledges financial support from the Spanish Ministry of Science and Innovation (MICINN) projects AYA2017-86389-P and PID2020-117493GB-I00. C.J.M. acknowledges financial support from Imperial College London through an Imperial College Research Fellowship grant. M.V. and L.B.e.S. acknowledge support from NASA-ATP award 80NSSC20K0509. The work of A.D. and J.N. is supported by NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. T.S.L. acknowledges financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) through grant RGPIN-2022-04794. B.T. G. was supported by grant ST/T000406/1 from the Science and Technology Facilities Council (STFC). This project has received funding from the European Research Council under the European Unionʼs Horizon 2020 research and innovation program (grant agreement No. 101020057). This research made use of computing time available on the high-performance computing system at the Instituto de Astrofisica de Canarias

Published
2023
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2. The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument

Author

Adam D. Myers, John Moustakas, Stephen Bailey, Benjamin A. Weaver, Andrew P. Cooper, Jaime E. Forero-Romero, Bela Abolfathi, David M. Alexander, David Brooks, Edmond Chaussidon, Chia-Hsun Chuang, Kyle Dawson, Arjun Dey, Biprateep Dey, Govinda Dhungana, Peter Doel, Kevin Fanning, Enrique Gaztañaga, Satya Gontcho A Gontcho, Alma X. Gonzalez-Morales, ChangHoon Hahn, Hiram K. Herrera-Alcantar, Klaus Honscheid, Mustapha Ishak, Tanveer Karim, David Kirkby, Theodore Kisner, Sergey E. Koposov, Anthony Kremin, Ting-Wen Lan, Martin Landriau, Dustin Lang, Michael E. Levi, Christophe Magneville, Lucas Napolitano, Paul Martini, Aaron Meisner, Jeffrey A. Newman, Nathalie Palanque-Delabrouille, Will Percival, Claire Poppett, Francisco Prada, Anand Raichoor, Ashley J. Ross, Edward F. Schlafly, David Schlegel, Michael Schubnell, Ting Tan, Gregory Tarle, Michael J. Wilson, Christophe Yèche, Rongpu Zhou, Zhimin Zhou, Hu Zou, Moustakas, J [0000-0002-2733-4559], Bailey, S [0000-0003-4162-6619], Cooper, AP [0000-0001-8274-158X], Forero-Romero, JE [0000-0002-2890-3725], Abolfathi, B [0000-0003-1820-8486], Alexander, DM [0000-0002-5896-6313], Brooks, D [0000-0002-8458-5047], Chaussidon, E [0000-0001-8996-4874], Chuang, CH [0000-0002-3882-078X], Dawson, K [0000-0002-0553-3805], Dey, A [0000-0002-4928-4003], Dey, B [0000-0002-5665-7912], Dhungana, G [0000-0002-5402-1216], Gaztañaga, E [0000-0001-9632-0815], Gonzalez-Morales, AX [0000-0003-4089-6924], Hahn, CH [0000-0003-1197-0902], Herrera-Alcantar, HK [0000-0002-9136-9609], Ishak, M [0000-0002-6024-466X], Karim, T [0000-0002-5652-8870], Kirkby, D [0000-0002-8828-5463], Kisner, T [0000-0003-3510-7134], Koposov, SE [0000-0003-2644-135X], Kremin, A [0000-0001-6356-7424], Lan, TW [0000-0001-8857-7020], Landriau, M [0000-0003-1838-8528], Lang, D [0000-0002-1172-0754], Levi, ME [0000-0003-1887-1018], Napolitano, L [0000-0002-5166-8671], Martini, P [0000-0002-4279-4182], Meisner, A [0000-0002-1125-7384], Newman, JA [0000-0001-8684-2222], Palanque-Delabrouille, N [0000-0003-3188-784X], Percival, W [0000-0002-0644-5727], Prada, F [0000-0001-7145-8674], Raichoor, A [0000-0001-5999-7923], Schlafly, EF [0000-0002-3569-7421], Schlegel, D [0000-0002-5042-5088], Tan, T [0000-0001-8289-1481], Tarle, G [0000-0003-1704-0781], Yèche, C [0000-0001-5146-8533], Zhou, R [0000-0001-5381-4372], Zhou, Z [0000-0002-4135-0977], Zou, H [0000-0002-6684-3997], Apollo - University of Cambridge Repository, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Ministerio de Ciencia e Innovación (España)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.GA, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), astro-ph.CO, 7 Affordable and Clean Energy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Astrophysics - Instrumentation and Methods for Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Instrumentation and Methods for Astrophysics (astro-ph.IM), 51 Physical Sciences, Astrophysics - Cosmology and Nongalactic Astrophysics, astro-ph.IM
Abstract

Full list of authors: Myers, Adam D.; Moustakas, John; Bailey, Stephen; Weaver, Benjamin A.; Cooper, Andrew P.; Forero-Romero, Jaime E.; Abolfathi, Bela; Alexander, David M.; Brooks, David; Chaussidon, Edmond; Chuang, Chia-Hsun; Dawson, Kyle; Dey, Arjun; Dey, Biprateep; Dhungana, Govinda; Doel, Peter; Fanning, Kevin; Gaztanaga, Enrique; Gontcho, Satya Gontcho; Gonzalez-Morales, Alma X.; Hahn, ChangHoon; Herrera-Alcantar, Hiram K.; Honscheid, Klaus; Ishak, Mustapha; Karim, Tanveer; Kirkby, David; Kisner, Theodore; Koposov, Sergey E.; Kremin, Anthony; Lan, Ting-Wen; Landriau, Martin; Lang, Dustin; Levi, Michael E.; Magneville, Christophe; Napolitano, Lucas; Martini, Paul; Meisner, Aaron; Newman, Jeffrey A.; Palanque-Delabrouille, Nathalie; Percival, Will; Poppett, Claire; Prada, Francisco; Raichoor, Anand; Ross, Ashley J.; Schlafly, Edward F.; Schlegel, David; Schubnell, Michael; Tan, Ting; Tarle, Gregory; Wilson, Michael J.; Yeche, Christophe; Zhou, Rongpu; Zhou, Zhimin; Zou, Hu.--This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited., In 2021 May, the Dark Energy Spectroscopic Instrument (DESI) began a 5 yr survey of approximately 50 million total extragalactic and Galactic targets. The primary DESI dark-time targets are emission line galaxies, luminous red galaxies, and quasars. In bright time, DESI will focus on two surveys known as the Bright Galaxy Survey and the Milky Way Survey. DESI also observes a selection of "secondary" targets for bespoke science goals. This paper gives an overview of the publicly available pipeline (desitarget) used to process targets for DESI observations. Highlights include details of the different DESI survey targeting phases, the targeting ID (TARGETID) used to define unique targets, the bitmasks used to indicate a particular type of target, the data model and structure of DESI targeting files, and examples of how to access and use the desitarget code base. This paper will also describe "supporting" DESI target classes, such as standard stars, sky locations, and random catalogs that mimic the angular selection function of DESI targets. The DESI target-selection pipeline is complex and sizable; this paper attempts to summarize the most salient information required to understand and work with DESI targeting data. © 2023. The Author(s). Published by the American Astronomical Society., A.D.M. and J.M. were supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Numbers DE-SC0019022 and DE-SC0020086. A.P.C. is supported by a Taiwan Ministry of Education Yushan Fellowship and Taiwan Ministry of Science and Technology grant No. 109-2112-M-007-011-MY3. This research is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No. DEAC0205CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; additional support for DESI is provided by the U.S. National Science Foundation, Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technologies Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain (MICINN), and by the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutions., With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).

Published
2023
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3. Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument

Author

DESI Collaboration, Abareshi, B., Aguilar, J., Ahlen, S., Alam, Shadab, Alexander, David M., Alfarsy, R., Allen, L., Prieto, C. Allende, Alves, O., Ameel, J., Armengaud, E., Asorey, J., Aviles, Alejandro, Bailey, S., Balaguera-Antolínez, A., Ballester, O., Baltay, C., Bault, A., Beltran, S. F., Benavides, B., BenZvi, S., Berti, A., Besuner, R., Beutler, Florian, Bianchi, D., Blake, C., Blanc, P., Blum, R., Bolton, A., Bose, S., Bramall, D., Brieden, S., Brodzeller, A., Brooks, D., Brownewell, C., Buckley-Geer, E., Cahn, R. N., Cai, Z., Canning, R., Capasso, R., Rosell, A. Carnero, Carton, P., Casas, R., Castander, F. J., Cervantes-Cota, J. L., Chabanier, S., Chaussidon, E., Chuang, C., Circosta, C., Cole, S., Cooper, A. P., Costa, L. Da, Cousinou, M.-C., Cuceu, A., Davis, T. M., Dawson, K., Cruz-Noriega, R. De La, Macorra, A. De La, Mattia, A. De, Costa, J. Della, Demmer, P., Derwent, M., Dey, A., Dey, B., Dhungana, G., Ding, Z., Dobson, C., Doel, P., Donald-McCann, J., Donaldson, J., Douglass, K., Duan, Y., Dunlop, P., Edelstein, J., Eftekharzadeh, S., Eisenstein, D. J., Enriquez-Vargas, M., Escoffier, S., Evatt, M., Fagrelius, P., Fan, X., Fanning, K., Fawcett, V. A., Ferraro, S., Ereza, J., Flaugher, B., Font-Ribera, A., Forero-Romero, J. E., Frenk, C. S., Fromenteau, S., Gänsicke, B. T., Garcia-Quintero, C., Garrison, L., Gaztañaga, E., Gerardi, F., Gil-Marín, H., A Gontcho, S. Gontcho, Gonzalez-Morales, Alma X., Gonzalez-De-Rivera, G., Gonzalez-Perez, V., Gordon, C., Graur, O., Green, D., Grove, C., Gruen, D., Gutierrez, G., Guy, J., Hahn, C., Harris, S., Herrera, D., Herrera-Alcantar, Hiram K., Honscheid, K., Howlett, C., Huterer, D., Iršič, V., Ishak, M., Jelinsky, P., Jiang, L., Jimenez, J., Jing, Y. P., Joyce, R., Jullo, E., Juneau, S., Karaçaylı, N. G., Karamanis, M., Karcher, A., Karim, T., Kehoe, R., Kent, S., Kirkby, D., Kisner, T., Kitaura, F., Koposov, S. E., Kovács, A., Kremin, A., Krolewski, Alex, L’Huillier, B., Lahav, O., Lambert, A., Lamman, C., Lan, Ting-Wen, Landriau, M., Lane, S., Lang, D., Lange, J. U., Lasker, J., Guillou, L. Le, Leauthaud, A., Van Suu, A. Le, Levi, Michael E., Li, T. S., Magneville, C., Manera, M., Manser, Christopher J., Marshall, B., Martini, Paul, McCollam, W., McDonald, P., Meisner, Aaron M., Mena-Fernández, J., Meneses-Rizo, J., Mezcua, M., Miller, T., Miquel, R., Montero-Camacho, P., Moon, J., Moustakas, J., Mueller, E., Muñoz-Gutiérrez, Andrea, Myers, Adam D., Nadathur, S., Najita, J., Napolitano, L., Neilsen, E., Newman, Jeffrey A., Nie, J. D., Ning, Y., Niz, G., Norberg, P., Noriega, Hernán E., O’Brien, T., Obuljen, A., Palanque-Delabrouille, N., Palmese, A., Zhiwei, P., Pappalardo, D., PENG, X., Percival, W. J., Perruchot, S., Pogge, R., Poppett, C., Porredon, A., Prada, F., Prochaska, J., Pucha, R., Pérez-Fernández, A., Pérez-Ràfols, I., Rabinowitz, D., Raichoor, A., Ramirez-Solano, S., Ramírez-Pérez, César, Ravoux, C., Reil, K., Rezaie, M., Rocher, A., Rockosi, C., Roe, N. A., Roodman, A., Ross, A. J., Rossi, G., Ruggeri, R., Ruhlmann-Kleider, V., Sabiu, C. G., Safonova, S., Said, K., Saintonge, A., Catonga, Javier Salas, Samushia, L., Sanchez, E., Saulder, C., Schaan, E., Schlafly, E., Schlegel, D., Schmoll, J., Scholte, D., Schubnell, M., Secroun, A., Seo, H., Serrano, S., Sharples, Ray M., Sholl, Michael J., Silber, Joseph Harry, Silva, D. R., Sirk, M., Siudek, M., Smith, A., Sprayberry, D., Staten, R., Stupak, B., Tan, T., Tarlé, Gregory, Tie, Suk Sien, Tojeiro, R., Ureña-López, L. A., Valdes, F., Valenzuela, O., Valluri, M., Vargas-Magaña, M., Verde, L., Walther, M., Wang, B., Wang, M. S., Weaver, B. A., Weaverdyck, C., Wechsler, R., Wilson, Michael J., Yang, J., Yu, Y., Yuan, S., Yèche, Christophe, Zhang, H., Zhang, K., Zhao, Cheng, Zhou, Rongpu, Zhou, Zhimin, Zou, H., Zou, J., Zou, S., Zu, Y., Aguilar, J. [0000-0003-0822-452X], Ahlen, S. [0000-0001-6098-7247], Alam, Shadab [0000-0002-3757-6359], Alexander, David M. [0000-0002-5896-6313], Allen, L. [0000-0002-7789-5119], Prieto, C. Allende [0000-0002-0084-572X], Ameel, J. [0000-0003-3638-2584], Asorey, J. [0000-0002-6211-499X], Bailey, S. [0000-0003-4162-6619], Balaguera-Antolínez, A. [0000-0001-5028-3035], Ballester, O. [0000-0002-7126-5300], Bault, A. [0000-0002-9964-1005], Beltran, S. F. [0000-0001-6324-4019], Berti, A. [0000-0003-3582-6649], Beutler, Florian [0000-0003-0467-5438], Bose, S. [0000-0002-0974-5266], Brieden, S. [0000-0003-3896-9215], Brodzeller, A. [0000-0002-8934-0954], Brooks, D. [0000-0002-8458-5047], Cahn, R. N. [0000-0003-2748-0641], Cai, Z. [0000-0001-8467-6478], Capasso, R. [0000-0002-3083-6840], Rosell, A. Carnero [0000-0003-3044-5150], Castander, F. J. [0000-0001-7316-4573], Cervantes-Cota, J. L. [0000-0002-3057-6786], Chabanier, S. [0000-0002-5692-5243], Chaussidon, E. [0000-0001-8996-4874], Chuang, C. [0000-0002-3882-078X], Cole, S. [0000-0002-5954-7903], Cooper, A. P. [0000-0001-8274-158X], Cuceu, A. [0000-0002-2169-0595], Davis, T. M. [0000-0002-4213-8783], Dawson, K. [0000-0002-0553-3805], Costa, J. Della [0000-0003-0928-2000], Dey, A. [0000-0002-4928-4003], Dey, B. [0000-0002-5665-7912], Dhungana, G. [0000-0002-5402-1216], Ding, Z. [0000-0002-3369-3718], Douglass, K. [0000-0002-9540-546X], Duan, Y. [0000-0002-2611-0895], Eisenstein, D. J. [0000-0002-2929-3121], Escoffier, S. [0000-0002-2847-7498], Fan, X. [0000-0003-3310-0131], Fawcett, V. A. [0000-0003-1251-532X], Ereza, J. [0000-0002-0194-4017], Frenk, C. S. [0000-0002-2338-716X], Gänsicke, B. T. [0000-0002-2761-3005], Garrison, L. [0000-0002-9853-5673], Gaztañaga, E. [0000-0001-9632-0815], Gonzalez-Morales, Alma X. [0000-0003-4089-6924], Gonzalez-de-Rivera, G. [0000-0003-4452-743X], Gonzalez-Perez, V. [0000-0001-9938-2755], Graur, O. [0000-0002-4391-6137], Green, D. [0000-0002-0676-3661], Gruen, D. [0000-0003-3270-7644], Hahn, C. [0000-0003-1197-0902], Herrera, D. [0000-0003-2092-6727], Herrera-Alcantar, Hiram K. [0000-0002-9136-9609], Huterer, D. [0000-0001-6558-0112], Iršič, V. [0000-0002-5445-461X], Ishak, M. [0000-0002-6024-466X], Jiang, L. [0000-0003-4176-6486], Jing, Y. P. [0000-0002-4534-3125], Joyce, R. [0000-0003-0201-5241], Jullo, E. [0000-0002-9253-053X], Juneau, S. [0000-0002-0000-2394], Karaçaylı, N. G. [0000-0001-7336-8912], Karamanis, M. [0000-0001-9489-4612], Karim, T. [0000-0002-5652-8870], Kehoe, R. [0000-0002-7101-697X], Kent, S. [0000-0003-4207-7420], Kirkby, D. [0000-0002-8828-5463], Kisner, T. [0000-0003-3510-7134], Koposov, S. E. [0000-0003-2644-135X], Kovács, A. [0000-0002-5825-579X], Kremin, A. [0000-0001-6356-7424], L’Huillier, B. [0000-0003-2934-6243], Landriau, M. [0000-0003-1838-8528], Lang, D. [0000-0002-1172-0754], Lasker, J. [0000-0003-2999-4873], Guillou, L. Le [0000-0001-7178-8868], Leauthaud, A. [0000-0002-3677-3617], Van Suu, A. Le [0000-0001-5488-783X], Levi, Michael E. [0000-0003-1887-1018], Li, T. S. [0000-0002-9110-6163], Manser, Christopher J. [0000-0003-1543-5405], Martini, Paul [0000-0002-0194-4017], McDonald, P. [0000-0001-8346-8394], Meisner, Aaron M. [0000-0002-1125-7384], Mena-Fernández, J. [0000-0001-9497-7266], Meneses-Rizo, J. [0000-0003-3201-9788], Miquel, R. [0000-0002-6610-4836], Moustakas, J. [0000-0002-2733-4559], Nadathur, S. [0000-0001-9070-3102], Neilsen, E. [0000-0002-7357-0317], Newman, Jeffrey A. [0000-0001-8684-2222], Nie, J. D. [0000-0001-6590-8122], Ning, Y. [0000-0001-9442-1217], Niz, G. [0000-0002-1544-8946], Norberg, P. [0000-0002-5875-0440], Noriega, Hernán E. [0000-0002-3397-3998], Obuljen, A. [0000-0002-9012-6621], Palanque-Delabrouille, N. [0000-0003-3188-784], PENG, X. [0000-0002-3784-830X], Percival, W. J. [0000-0002-0644-5727], Pogge, R. [0000-0003-1435-3053], Porredon, A. [0000-0002-2762-2024], Prada, F. [0000-0001-7145-8674], Prochaska, J. [0000-0002-7738-6875], Pucha, R. [0000-0002-4940-3009], Pérez-Ràfols, I. [0000-0001-6979-0125], Rabinowitz, D. [0000-0003-4961-7653], Raichoor, A. [0000-0001-5999-7923], Rezaie, M. [0000-0001-5589-7116], Rockosi, C. [0000-0002-6667-7028], Roodman, A. [0000-0001-5326-3486], Sabiu, C. G. [0000-0002-5513-5303], Safonova, S. [0000-0002-2240-7421], Said, K. [0000-0002-1809-6325], Saintonge, A. [0000-0003-4357-3450], Samushia, L. [0000-0002-1609-5687], Sanchez, E. [0000-0002-9646-8198], Saulder, C. [0000-0002-0408-5633], Schaan, E. [0000-0002-4619-8927], Schlegel, D. [0000-0002-5042-5088], Secroun, A. [0000-0003-0505-3710], Seo, H. [0000-0002-6588-3508], Sharples, Ray M. [0000-0003-3449-8583], Silber, Joseph Harry [0000-0002-3461-0320], Silva, D. R. [0000-0002-7678-2155], Sprayberry, D. [0000-0001-7583-6441], Tarlé, Gregory [0000-0003-1704-0781], Tie, Suk Sien [0000-0002-5249-1353], Valdes, F. [0000-0001-5567-1301], Valenzuela, O. [0000-0002-0523-5509], Valluri, M. [0000-0002-6257-2341], Verde, L. [0000-0003-2601-8770], Walther, M. [0000-0002-1748-3745], Wang, B. [0000-0003-4877-1659], Wang, M. S. [0000-0002-2652-4043], Wechsler, R. [0000-0003-2229-011X], Yang, J. [0000-0001-5287-4242], Yu, Y. [0000-0002-9359-7170], Yuan, S. [0000-0002-5992-7586], Yèche, Christophe [0000-0001-5146-8533], Zhang, H. [0000-0001-6847-5254], Zhang, K. [0000-0002-9808-3646], Zhao, Cheng [0000-0002-1991-7295], Zhou, Rongpu [0000-0001-5381-4372], Zhou, Zhimin [0000-0002-4135-0977], Zou, H. [0000-0002-6684-3997], Zou, J. [0000-0001-9189-0368], Zou, S. [0000-0002-3983-6484], Zu, Y. [0000-0001-6966-6925], Apollo - University of Cambridge Repository, University of St Andrews. School of Physics and Astronomy, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Observatoire de Haute-Provence (OHP), Institut Pythéas (OSU PYTHEAS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DESI, HEP, INSPIRE, and Ministerio de Ciencia e Innovación (España)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, redshift 0.6, Settore FIS/05 - Astronomia e Astrofisica, QB Astronomy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation and Methods for Astrophysics (astro-ph.IM), QC, QB, MCC, Astronomy and Astrophysics, DAS, space, distortions, peak, Laboratory Astrophysics, Instrumentation, Software, and Data, QC Physics, Space and Planetary Science, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], astro-ph.CO, galaxy sample, power-spectrum, Astrophysics - Instrumentation and Methods for Astrophysics, [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], growth-rate, Astrophysics - Cosmology and Nongalactic Astrophysics, astro-ph.IM
Abstract

Full list of authors: Abareshi, B.; Aguilar, J.; Ahlen, S.; Alam, Shadab; Alexander, David M.; Alfarsy, R.; Allen, L.; Allende Prieto, C.; Alves, O.; Ameel, J.; Armengaud, E.; Asorey, J.; Aviles, Alejandro; Bailey, S.; Balaguera-Antolinez, A.; Ballester, O.; Baltay, C.; Bault, A.; Beltran, S. F.; Benavides, B.; BenZvi, S.; Berti, A.; Besuner, R.; Beutler, Florian; Bianchi, D.; Blake, C.; Blanc, P.; Blum, R.; Bolton, A.; Bose, S.; Bramall, D.; Brieden, S.; Brodzeller, A.; Brooks, D.; Brownewell, C.; Buckley-Geer, E.; Cahn, R. N.; Cai, Z.; Canning, R.; Capasso, R.; Carnero Rosell, A.; Carton, P.; Casas, R.; Castander, F. J.; Cervantes-Cota, J. L.; Chabanier, S.; Chaussidon, E.; Chuang, C.; Circosta, C.; Cole, S.; Cooper, A. P.; da Costa, L.; Cousinou, M-C; Cuceu, A.; Davis, T. M.; Dawson, K.; De la Cruz-Noriega, R.; de la Macorra, A.; de Mattia, A.; Della Costa, J.; Demmer, P.; Derwent, M.; Dey, A.; Dey, B.; Dhungana, G.; Ding, Z.; Dobson, C.; Doel, P.; Donald-McCann, J.; Donaldson, J.; Douglass, K.; Duan, Y.; Dunlop, P.; Edelstein, J.; Eftekharzadeh, S.; Eisenstein, D. J.; Enriquez-Vargas, M.; Escoffier, S.; Evatt, M.; Fagrelius, P.; Fan, X.; Fanning, K.; Fawcett, V. A.; Ferraro, S.; Ereza, J.; Flaugher, B.; Font-Ribera, A.; Forero-Romero, J. E.; Frenk, C. S.; Fromenteau, S.; Gansicke, B. T.; Garcia-Quintero, C.; Garrison, L.; Gaztanaga, E.; Gerardi, F.; Gil-Marin, H.; Gontcho, S. Gontcho A.; Gonzalez-Morales, Alma X.; Gonzalez-de-Rivera, G.; Gonzalez-Perez, V; Gordon, C.; Graur, O.; Green, D.; Grove, C.; Gruen, D.; Gutierrez, G.; Guy, J.; Hahn, C.; Harris, S.; Herrera, D.; Herrera-Alcantar, Hiram K.; Honscheid, K.; Howlett, C.; Huterer, D.; Irsic, V; Ishak, M.; Jelinsky, P.; Jiang, L.; Jimenez, J.; Jing, Y. P.; Joyce, R.; Jullo, E.; Juneau, S.; Karacayli, N. G.; Karamanis, M.; Karcher, A.; Karim, T.; Kehoe, R.; Kent, S.; Kirkby, D.; Kisner, T.; Kitaura, F.; Koposov, S. E.; Kovacs, A.; Kremin, A.; Krolewski, Alex; L'Huillier, B.; Lahav, O.; Lambert, A.; Lamman, C.; Lan, Ting-Wen; Landriau, M.; Lane, S.; Lang, D.; Lange, J. U.; Lasker, J.; Le Guillou, L.; Leauthaud, A.; Suu, A. Le Van; Levi, Michael E.; Li, T. S.; Magneville, C.; Manera, M.; Manser, Christopher J.; Marshall, B.; Martini, Paul; McCollam, W.; McDonald, P.; Meisner, Aaron M.; Mena-Fernandez, J.; Meneses-Rizo, J.; Mezcua, M.; Miller, T.; Miquel, R.; Montero-Camacho, P.; Moon, J.; Moustakas, J.; Mueller, E.; Munoz-Gutierrez, Andrea; Myers, Adam D.; Nadathur, S.; Najita, J.; Napolitano, L.; Neilsen, E.; Newman, Jeffrey A.; Nie, J. D.; Ning, Y.; Niz, G.; Norberg, P.; Noriega, Hernan E.; O'Brien, T.; Obuljen, A.; Palanque-Delabrouille, N.; Palmese, A.; Zhiwei, P.; Pappalardo, D.; Peng, X.; Percival, W. J.; Perruchot, S.; Pogge, R.; Poppett, C.; Porredon, A.; Prada, F.; Prochaska, J.; Pucha, R.; Perez-Fernandez, A.; Perez-Rafols, I; Rabinowitz, D.; Raichoor, A.; Ramirez-Solano, S.; Ramirez-Perez, Cesar; Ravoux, C.; Reil, K.; Rezaie, M.; Rocher, A.; Rockosi, C.; Roe, N. A.; Roodman, A.; Ross, A. J.; Rossi, G.; Ruggeri, R.; Ruhlmann-Kleider, V; Sabiu, C. G.; Safonova, S.; Said, K.; Saintonge, A.; Catonga, Javier Salas; Samushia, L.; Sanchez, E.; Saulder, C.; Schaan, E.; Schlafly, E.; Schlegel, D.; Schmoll, J.; Scholte, D.; Schubnell, M.; Secroun, A.; Seo, H.; Serrano, S.; Sharples, Ray M.; Sholl, Michael J.; Silber, Joseph Harry; Silva, D. R.; Sirk, M.; Siudek, M.; Smith, A.; Sprayberry, D.; Staten, R.; Stupak, B.; Tan, T.; Tarle, Gregory; Tie, Suk Sien; Tojeiro, R.; Urena-Lopez, L. A.; Valdes, F.; Valenzuela, O.; Valluri, M.; Vargas-Magana, M.; Verde, L.; Walther, M.; Wang, B.; Wang, M. S.; Weaver, B. A.; Weaverdyck, C.; Wechsler, R.; Wilson, Michael J.; Yang, J.; Yu, Y.; Yuan, S.; Yeche, Christophe; Zhang, H.; Zhang, K.; Zhao, Cheng; Zhou, Rongpu; Zhou, Zhimin; Zou, H.; Zou, J.; Zou, S.; Zu, Y.; DESI Collaboration.--This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited., The Dark Energy Spectroscopic Instrument (DESI) embarked on an ambitious 5 yr survey in 2021 May to explore the nature of dark energy with spectroscopic measurements of 40 million galaxies and quasars. DESI will determine precise redshifts and employ the baryon acoustic oscillation method to measure distances from the nearby universe to beyond redshift z > 3.5, and employ redshift space distortions to measure the growth of structure and probe potential modifications to general relativity. We describe the significant instrumentation we developed to conduct the DESI survey. This includes: a wide-field, 3fdg2 diameter prime-focus corrector; a focal plane system with 5020 fiber positioners on the 0.812 m diameter, aspheric focal surface; 10 continuous, high-efficiency fiber cable bundles that connect the focal plane to the spectrographs; and 10 identical spectrographs. Each spectrograph employs a pair of dichroics to split the light into three channels that together record the light from 360–980 nm with a spectral resolution that ranges from 2000–5000. We describe the science requirements, their connection to the technical requirements, the management of the project, and interfaces between subsystems. DESI was installed at the 4 m Mayall Telescope at Kitt Peak National Observatory and has achieved all of its performance goals. Some performance highlights include an rms positioner accuracy of better than 0farcs1 and a median signal-to-noise ratio of 7 of the [O ii] doublet at 8 × 10−17 erg s−1 cm−2 in 1000 s for galaxies at z = 1.4–1.6. We conclude with additional highlights from the on-sky validation and commissioning, key successes, and lessons learned. © 2022. The Author(s). Published by the American Astronomical Society., This research is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract. Additional support for DESI is provided by the U.S. National Science Foundation, Division of Astronomical Sciences under contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technologies Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising–Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain, and by the DESI Member Institutions: Aix-Marseille University; Argonne National Laboratory; Barcelona-Madrid Regional Participation Group; Brookhaven National Laboratory; Boston University; Brazil Regional Participation Group; Carnegie Mellon University; CEA-IRFU, Saclay; China Participation Group; Cornell University; Durham University; École Polytechnique Fédérale de Lausanne; Eidgenössische Technische Hochschule, Zürich; Fermi National Accelerator Laboratory; Granada-Madrid-Tenerife Regional Participation Group; Harvard University; Kansas State University; Korea Astronomy and Space Science Institute; Korea Institute for Advanced Study; Lawrence Berkeley National Laboratory; Laboratoire de Physique Nucléaire et de Hautes Energies; Ludwig Maximilians University; Max Planck Institute; Mexico Regional Participation Group; New York University; NSF's National Optical-Infrared Astronomy Research Laboratory; Ohio University; Perimeter Institute; Shanghai Jiao Tong University; Siena College; SLAC National Accelerator Laboratory; Southern Methodist University; Swinburne University; The Ohio State University; Universidad de los Andes; University of Arizona; University of Barcelona; University of California, Berkeley; University of California, Irvine; University of California, Santa Cruz; University College London; University of Florida; University of Michigan at Ann Arbor; University of Pennsylvania; University of Pittsburgh; University of Portsmouth; University of Queensland; University of Rochester; University of Toronto; University of Utah; University of Waterloo; University of Wyoming; University of Zurich; UK Regional Participation Group; and Yale University. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement., With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709.

Published
2022
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4. DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor

Author

Dey, A, Najita, Koposov, SE, Josephy-Zack, J, Maxemin, G, Bell, EF, Poppett, C, Patel, E, Beraldo E Silva, L, Raichoor, A, Schlegel, D, Lang, D, Meisner, A, Myers, AD, Aguilar, J, Ahlen, S, Allende Prieto, C, Brooks, D, Cooper, AP, Dawson, KS, Macorra, ADL, Doel, P, Font-Ribera, A, García-Bellido, J, Gontcho A Gontcho, S, Guy, J, Honscheid, K, Kehoe, R, Kisner, T, Kremin, A, Landriau, M, Le Guillou, L, Levi, ME, Li, TS, Martini, P, Miquel, R, Moustakas, J, Nie, J, Palanque-Delabrouille, N, Prada, F, Schlafly, EF, Sharples, RM, Tarlé, G, Ting, YS, Tyas, L, Valluri, M, Wechsler, RH, Zou, H, Ministerio de Ciencia e Innovación (España), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Dey, A [0000-0002-4928-4003], Najita, JR [0000-0002-5758-150X], Koposov, SE [0000-0003-2644-135X], Bell, EF [0000-0002-5564-9873], Patel, E [0000-0002-9820-1219], Beraldo e Silva, L [0000-0002-0740-1507], Raichoor, A [0000-0001-5999-7923], Schlegel, D [0000-0002-5042-5088], Meisner, A [0000-0002-1125-7384], Aguilar, J [0000-0003-0822-452X], Ahlen, S [0000-0001-6098-7247], Allende Prieto, C [0000-0002-0084-572X], Brooks, D [0000-0002-8458-5047], Cooper, AP [0000-0001-8274-158X], Dawson, KS [0000-0002-0553-3805], Font-Ribera, A [0000-0002-3033-7312], García-Bellido, J [0000-0002-9370-8360], Gontcho A Gontcho, S [0000-0003-3142-233X], Guy, J [0000-0001-9822-6793], Kehoe, R [0000-0002-7101-697X], Kisner, T [0000-0003-3510-7134], Kremin, A [0000-0001-6356-7424], Landriau, M [0000-0003-1838-8528], Le Guillou, L [0000-0001-7178-8868], Levi, ME [0000-0003-1887-1018], Li, TS [0000-0002-9110-6163], Martini, P [0000-0002-0194-4017], Miquel, R [0000-0002-6610-4836], Moustakas, J [0000-0002-2733-4559], Nie, J [0000-0001-6590-8122], Palanque-Delabrouille, N [0000-0003-3188-784X], Schlafly, EF [0000-0002-3569-7421], Sharples, RM [0000-0003-3449-8583], Tarlé, G [0000-0003-1704-0781], Ting, YS [0000-0001-5082-9536], Valluri, M [0000-0002-6257-2341], Wechsler, RH [0000-0003-2229-011X], Zou, H [0000-0002-6684-3997], and Apollo - University of Cambridge Repository

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), 5101 Astronomical Sciences, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), astro-ph.GA, astro-ph.CO, FOS: Physical sciences, Astronomy and Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Astrophysics of Galaxies, 51 Physical Sciences, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Full list of authors: Dey, Arjun; Najita, Joan R.; Koposov, Sergey E.; Josephy-Zack, J.; Maxemin, Gabriel; Bell, Eric F.; Poppett, C.; Patel, E.; Beraldo e Silva, L.; Raichoor, A.; Schlegel, D.; Lang, D.; Meisner, A.; Myers, Adam D.; Aguilar, J.; Ahlen, S.; Allende Prieto, C.; Brooks, D.; Cooper, A. P.; Dawson, K. S.; de la Macorra, A.; Doel, P.; Font-Ribera, A.; Garcia-Bellido, Juan; Gontcho, S. Gontcho A.; Guy, J.; Honscheid, K.; Kehoe, R.; Kisner, T.; Kremin, A.; Landriau, M.; Le Guillou, L.; Levi, Michael E.; Li, T. S.; Martini, Paul; Miquel, R.; Moustakas, J.; Nie, Jundan; Palanque-Delabrouille, N.; Prada, F.; Schlafly, E. F.; Sharples, Ray M.; Tarle, Gregory; Ting, Yuan-Sen; Tyas, L.; Valluri, M.; Wechsler, Risa H.; Zou, H.--This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited., We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail. Of the 11,416 sources studied in 3.75 hr of on-sky exposure time, 7438 are M31 sources with well-measured radial velocities. The observations reveal intricate coherent kinematic structure in the positions and velocities of individual stars: streams, wedges, and chevrons. While hints of coherent structures have been previously detected in M31, this is the first time they have been seen with such detail and clarity in a galaxy beyond the Milky Way. We find clear kinematic evidence for shell structures in the Giant Stellar Stream, the Northeast Shelf, and Western Shelf regions. The kinematics are remarkably similar to the predictions of dynamical models constructed to explain the spatial morphology of the inner halo. The results are consistent with the interpretation that much of the substructure in the inner halo of M31 is produced by a single galactic immigration event 1–2 Gyr ago. Significant numbers of metal-rich stars ([Fe/H] > − 0.5) are present in all of the detected substructures, suggesting that the immigrating galaxy had an extended star formation history. We also investigate the ability of the shells and Giant Stellar Stream to constrain the gravitational potential of M31, and estimate the mass within a projected radius of 125 kpc to be ${\mathrm{log}}_{10}\,{M}_{\mathrm{NFW}}(\lt 125\,\mathrm{kpc})/{M}_{\odot }={11.80}_{-0.10}^{+0.12}$. The results herald a new era in our ability to study stars on a galactic scale and the immigration histories of galaxies. © 2023. The Author(s). Published by the American Astronomical Society., A.D. and J.N.'s research activities are supported by the NSF's NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. A.D. and J.N.'s research is also supported in part by Fellowships from the John Simon Guggenheim Memorial Foundation and by the Institute for Theory and Computation at the Harvard-Smithsonian Center for Astrophysics. J.N. also acknowledges support from the Harvard Radcliffe Fellowship Program of the Radcliffe Institute for Advanced Study at Harvard University. J.N., G.M., and J.J.-Z. acknowledge support from the Harvard University's Radcliffe Research Partners Program of the Radcliffe Institute for Advanced Study. E.F.B. is grateful for support from the National Science Foundation through grant NSF-AST 2007065. L.B.S. acknowledges NASA-ATP award 80NSSC20K0509 and Science Foundation AAG grant AST-2009122. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This research is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; additional support for DESI is provided by the U.S. National Science Foundation, Division of Astronomical Sciences under contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technologies Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain (MICINN), and by the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutions. The authors are honored to be permitted to conduct scientific research on Iolkam Du'ag (Kitt Peak), a mountain with particular significance to the Tohono O'odham Nation. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611. This work was partially supported by a grant from the Simons Foundation., With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).

Published
2023
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5. Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument

Author

Abareshi, B, Aguilar, J, Ahlen, S, Alam, S, Alexander, DM, Alfarsy, R, Allen, L, Prieto, CA, Alves, O, Ameel, J, Armengaud, E, Asorey, J, Aviles, A, Bailey, S, Balaguera-Antolínez, A, Ballester, O, Baltay, C, Bault, A, Beltran, SF, Benavides, B, Benzvi, S, Berti, A, Besuner, R, Beutler, F, Bianchi, D, Blake, C, Blanc, P, Blum, R, Bolton, A, Bose, S, Bramall, D, Brieden, S, Brodzeller, A, Brooks, D, Brownewell, C, Buckley-Geer, E, Cahn, RN, Cai, Z, Canning, R, Capasso, R, Rosell, AC, Carton, P, Casas, R, Castander, FJ, Cervantes-Cota, JL, Chabanier, S, Chaussidon, E, Chuang, C, Circosta, C, Cole, S, Cooper, AP, Costa, LD, Cousinou, MC, Cuceu, A, Davis, TM, Dawson, K, Cruz-Noriega, RDL, Macorra, ADL, Mattia, AD, Costa, JD, Demmer, P, Derwent, M, Dey, A, Dey, B, Dhungana, G, Ding, Z, Dobson, C, Doel, P, Donald-Mccann, J, Donaldson, J, Douglass, K, Duan, Y, Dunlop, P, Edelstein, J, Eftekharzadeh, S, Eisenstein, DJ, Enriquez-Vargas, M, Escoffier, S, Evatt, M, Fagrelius, P, Fan, X, Fanning, K, Fawcett, VA, Ferraro, S, Ereza, J, Flaugher, B, Font-Ribera, A, Forero-Romero, JE, Frenk, CS, Fromenteau, S, Gänsicke, BT, Garcia-Quintero, C, Garrison, L, Gaztañaga, E, Gerardi, F, Gil-Marín, H, A Gontcho, SG, Gonzalez-Morales, AX, Gonzalez-De-Rivera, G, Gonzalez-Perez, V, Aguilar, J [0000-0003-0822-452X], Ahlen, S [0000-0001-6098-7247], Alam, S [0000-0002-3757-6359], Alexander, DM [0000-0002-5896-6313], Allen, L [0000-0002-7789-5119], Prieto, CA [0000-0002-0084-572X], Ameel, J [0000-0003-3638-2584], Asorey, J [0000-0002-6211-499X], Bailey, S [0000-0003-4162-6619], Balaguera-Antolínez, A [0000-0001-5028-3035], Ballester, O [0000-0002-7126-5300], Bault, A [0000-0002-9964-1005], Beltran, SF [0000-0001-6324-4019], Berti, A [0000-0003-3582-6649], Beutler, F [0000-0003-0467-5438], Bose, S [0000-0002-0974-5266], Brieden, S [0000-0003-3896-9215], Brodzeller, A [0000-0002-8934-0954], Brooks, D [0000-0002-8458-5047], Cahn, RN [0000-0003-2748-0641], Cai, Z [0000-0001-8467-6478], Capasso, R [0000-0002-3083-6840], Rosell, AC [0000-0003-3044-5150], Castander, FJ [0000-0001-7316-4573], Cervantes-Cota, JL [0000-0002-3057-6786], Chabanier, S [0000-0002-5692-5243], Chaussidon, E [0000-0001-8996-4874], Chuang, C [0000-0002-3882-078X], Cole, S [0000-0002-5954-7903], Cooper, AP [0000-0001-8274-158X], Cuceu, A [0000-0002-2169-0595], Davis, TM [0000-0002-4213-8783], Dawson, K [0000-0002-0553-3805], Costa, JD [0000-0003-0928-2000], Dey, A [0000-0002-4928-4003], Dey, B [0000-0002-5665-7912], Dhungana, G [0000-0002-5402-1216], Ding, Z [0000-0002-3369-3718], Douglass, K [0000-0002-9540-546X], Duan, Y [0000-0002-2611-0895], Eisenstein, DJ [0000-0002-2929-3121], Escoffier, S [0000-0002-2847-7498], Fan, X [0000-0003-3310-0131], Fawcett, VA [0000-0003-1251-532X], Frenk, CS [0000-0002-2338-716X], Gänsicke, BT [0000-0002-2761-3005], Garrison, L [0000-0002-9853-5673], Gaztañaga, E [0000-0001-9632-0815], Gonzalez-Morales, AX [0000-0003-4089-6924], Gonzalez-De-Rivera, G [0000-0003-4452-743X], Gonzalez-Perez, V [0000-0001-9938-2755], and Apollo - University of Cambridge Repository

Subjects
5101 Astronomical Sciences, astro-ph.CO, Astronomy & Astrophysics, 51 Physical Sciences, Astronomical and Space Sciences, astro-ph.IM, Laboratory Astrophysics, Instrumentation, Software, and Data
Abstract

The Dark Energy Spectroscopic Instrument (DESI) has embarked on an ambitious five-year survey to explore the nature of dark energy with spectroscopy of 40 million galaxies and quasars. DESI will determine precise redshifts and employ the Baryon Acoustic Oscillation method to measure distances from the nearby universe to z > 3.5, as well as measure the growth of structure and probe potential modifications to general relativity. In this paper we describe the significant instrumentation we developed for the DESI survey. The new instrumentation includes a wide-field, 3.2-deg diameter prime-focus corrector that focuses the light onto 5020 robotic fiber positioners on the 0.812 m diameter, aspheric focal surface. The positioners and their fibers are divided among ten wedge-shaped petals. Each petal is connected to one of ten spectrographs via a contiguous, high-efficiency, nearly 50 m fiber cable bundle. The ten spectrographs each use a pair of dichroics to split the light into three channels that together record the light from 360 - 980 nm with a resolution of 2000 to 5000. We describe the science requirements, technical requirements on the instrumentation, and management of the project. DESI was installed at the 4-m Mayall telescope at Kitt Peak, and we also describe the facility upgrades to prepare for DESI and the installation and functional verification process. DESI has achieved all of its performance goals, and the DESI survey began in May 2021. Some performance highlights include RMS positioner accuracy better than 0.1", SNR per \sqrt{\AA} > 0.5 for a z > 2 quasar with flux 0.28e-17 erg/s/cm^2/A at 380 nm in 4000s, and median SNR = 7 of the [OII] doublet at 8e-17 erg/s/cm^2 in a 1000s exposure for emission line galaxies at z = 1.4 - 1.6. We conclude with highlights from the on-sky validation and commissioning of the instrument, key successes, and lessons learned. (abridged)

Published
2022

6. Overview of the DESI Legacy Imaging Surveys

Author

Dey, Arjun, Schlegel, David J., Lang, Dustin, Blum, Robert, Burleigh, Kaylan, Fan, Xiaohui, Findlay, Joseph R., Finkbeiner, Doug, Herrera, David, Juneau, Stephanie, Landriau, Martin, Levi, Michael, McGreer, Ian, Meisner, Aaron, Myers, Adam D., Moustakas, John, Nugent, Peter, Patej, Anna, Schlafly, Edward F., Walker, Alistair R., Valdes, Francisco, Weaver, Benjamin A., Yèche, Christophe, Zou, Hu, Zhou, Xu, Abareshi, Behzad, Abbott, T. M. C., Abolfathi, Bela, Aguilera, C., Alam, Shadab, Allen, Lori, Alvarez, A., Annis, James, Ansarinejad, Behzad, Aubert, Marie, Beechert, Jacqueline, Bell, Eric F., BenZvi, Segev Y., Beutler, Florian, Bielby, Richard M., Bolton, Adam S., Briceño, César, Buckley-Geer, Elizabeth J., Butler, Karen, Calamida, Annalisa, Carlberg, Raymond G., Carter, Paul, Casas, Ricard, Castander, Francisco J., Choi, Yumi, Comparat, Johan, Cukanovaite, Elena, Delubac, Timothee, DeVries, Kaitlin, Dey, Sharmila, Dhungana, Govinda, Dickinson, Mark, Ding, Zhejie, Donaldson, John B., Duan, Yutong, Duckworth, Christopher J., Eftekharzadeh, Sarah, Eisenstein, Daniel J., Etourneau, Thomas, Fagrelius, Parker A., Farihi, Jay, Fitzpatrick, Mike, Font-Ribera, Andreu, Fulmer, Leah, Gansicke, Boris T., Gaztanaga, Enrique, George, Koshy, Gerdes, David W., Gontcho, Satya Gontcho A., Gorgoni, Claudio, Green, Gregory, Guy, Julien, Harmer, Diane, Hernandez, M., Honscheid, Klaus, Lijuan, Huang, W., James, David, Jannuzi, Buell T., Jiang, Linhua, Joyce, Richard, Karcher, Armin, Karkar, Sonia, Kehoe, Robert, Kneib, Jean-Paul, Kueter-Young, Andrea, Lan, Ting-Wen, Lauer, Tod, Guillou, Laurent Le, Suu, Auguste Le Van, Lee, Jae Hyeon, Lesser, Michael, Levasseur, Laurence Perreault, Li, Ting S., Mann, Justin L., Marshall, Bob, Martinez-Vazquez, C. E., Martini, Paul, Bourboux, Helion du Mas des, McManus, Sean, Meier, Tobias Gabriel, Menard, Brice, Metcalfe, Nigel, Munoz-Gutierrez, Andrea, Najita, Joan, Napier, Kevin, Narayan, Gautham, Newman, Jeffrey A., Nie, Jundan, Nord, Brian, Norman, Dara J., Olsen, Knut A. G., Paat, Anthony, Palanque-Delabrouille, Nathalie, Peng, Xiyan, Poppett, Claire L., Poremba, Megan R., Prakash, Abhishek, Rabinowitz, David, Raichoor, Anand, Rezaie, Mehdi, Robertson, A. N., Roe, Natalie A., Ross, Ashley J., Ross, Nicholas P., Rudnick, Gregory, Safonova, Sasha, Saha, Abhijit, Sanchez, F. Javier, Savary, Elodie, Schweiker, Heidi, Scott, Adam, Seo, Hee-Jong, Shan, Huanyuan, Silva, David R., Slepian, Zachary, Soto, Christian, Sprayberry, David, Staten, Ryan, Stillman, Coley M., Stupak, Robert J., Summers, David L., Tie, Suk Sien, Tirado, H., Vargas-Magana, Mariana, Vivas, A. Katherina, Wechsler, Risa H., Williams, Doug, Yang, Jinyi, Yang, Qian, Yapici, Tolga, Zaritsky, Dennis, Zenteno, A., Zhang, Kai, Zhang, Tianmeng, Zhou, Rongpu, Zhou, Zhimin, Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Universidad Antonio Nariño (UAN), Département d'Astrophysique (ex SAP) (DAP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, National University of Defense Technology [China], Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Departamento de FisicaTeorica e IFT-UAM/CSIC, Universidad Autónoma de Madrid (UAM), EPFL Laboratoire d’astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), National Optical Astronomy Observatory (NOAO), Columbia University [New York], Institut de Ciencies de l'Espai [Barcelona] (ICE-CSIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Biologie des Interactions Neurones / Glie, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), University of Arizona, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU), Department of Physics and Astronomy [Pittsburgh], University of Pittsburgh (PITT), Pennsylvania Commonwealth System of Higher Education (PCSHE)-Pennsylvania Commonwealth System of Higher Education (PCSHE), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut Lagrange de Paris, Chimie, Modélisation et Imagerie pour la Biologie [Orsay], Université Paris-Sud - Paris 11 (UP11)-Institut Curie [Paris]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Computer Vision Center (Centre de visio per computador) (CVC), Universitat Autònoma de Barcelona (UAB), APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Ministry of Education Key Laboratory of Protein Sciences, Center for Structural Biology, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Universidad Autonoma de Madrid (UAM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), National Natural Science Foundation of China, Department of Energy (US), National Energy Research Scientific Computing Center (US), National Science Foundation (US), National Optical Astronomy Observatory (US), Lawrence Berkeley National Laboratory, Harvard University, Dey, Arjun, Schlegel, David J., Lang, Dustin, Blum, Robert, Fan, Xiaohui, Finkbeiner, Douglas, Herrera, David, Juneau, Stephanie, Landriau, Martin, Levi, Michael, McGreer, Ian, Meisner, Aaron, Moustakas, John, Nugent, Peter, Schlafly, Edward F., Walker, Alistair, Valdés, Francisco, Zou, Hu, Abolfathi, Bela, Allen, Lori, Annis, James, Ansarinejad, Behzad, Bell, Eric F., BenZvi, Segev, Beutler, Florian, Calamida, Annalisa, Carlberg, Raymond G., Casas, Richard, Castander, Francisco J., Choi, Yumi, Dickinson, Mark, Duan, Yutong, Fagrelius, Parker, Farihi, Jay, Fulmer, Leah, Gaztañaga, Enrique, George, Koshy, Gerdes, David W., Green, Gregory, James, David J., Jannuz, Buell T., Jiang, Linhua, Joyce, Richard, Karkar, Sonia, Kehoe, Robert, Lan, Ting-Wen, Lauer, Tod R., Le Guillou, Laurent, Lesser, Michael, Marshall, Robert, Martini, Paul, Mas des Bourboux, Hélion du, Metcalfe, Nigel, Narayan, Gautham, Newman, Jeffrey A., Nord, Brian, Olsen, Knut, Prakash, Abhishek, Ross, Nicholas P., Rudnick, Gregory, Safonova, Sasha, Saha, Abhijit, Schweiker, Heidi, Silva, David R., Sien, Suk, Vivas, Kathy, Yang, Jinyi, Yang, Qian, Yapici, Tolga, Zaritsky, Dennis, Zhang, Kai, Zhang, Tianmeng, Zhou, Rongpu, University of St Andrews. School of Physics and Astronomy, Dey, Arjun [0000-0002-4928-4003], Schlegel, David J. [0000-0002-5042-5088], Lang, Dustin [0000-0002-1172-0754], Blum, Robert [0000-0002-8622-4237], Fan, Xiaohui [0000-0003-3310-0131], Finkbeiner, Douglas [0000-0003-2808-275X], Herrera, David [0000-0003-2092-6727], Juneau, Stephanie [0000-0002-0000-2394], Landriau, Martin [0000-0003-1838-8528], Levi, Michael [0000-0003-1887-1018], McGreer, Ian [0000-0002-3461-5228], Meisner, Aaron [0000-0002-1125-7384], Moustakas, John [0000-0002-2733-4559], Nugent, Peter [0000-0002-3389-0586], Schlafly, Edward F. [0000-0002-3569-7421], Walker, Alistair [0000-0002-7123-8943], Valdés, Francisco [0000-0001-5567-1301], Zou, Hu [0000-0002-6684-3997], Abolfathi, Bela [0000-0003-1820-8486], Allen, Lori [0000-0002-7789-5119], Annis, James [0000-0002-0609-3987], Ansarinejad, Behzad [0000-0002-6443-3396], Bell, Eric F. [0000-0002-5564-9873], BenZvi, Segev [0000-0001-5537-4710], Beutler, Florian [0000-0003-0467-5438], Calamida, Annalisa [0000-0002-0882-7702], Carlberg, Raymond G. [0000-0002-7667-0081], Casas, Richard [0000-0002-8165-5601], Castander, Francisco J. [0000-0001-7316-4573], Choi, Yumi [0000-0003-1680-1884], Dickinson, Mark [0000-0001-5414-5131], Duan, Yutong [0000-0002-2611-0895], Fagrelius, Parker [0000-0001-6974-5826], Farihi, Jay [0000-0003-1748-602X], Fulmer, Leah [0000-0001-9247-7794], Gaztañaga, Enrique [0000-0001-9632-0815], George, Koshy [0000-0002-1734-8455], Gerdes, David W. [0000-0001-6942-2736], Green, Gregory [0000-0001-5417-2260], James, David J. [0000-0001-5160-4486], Jannuz, Buell T. [0000-0002-1578-6582], Jiang, Linhua [0000-0003-4176-6486], Joyce, Richard [0000-0003-0201-5241], Karkar, Sonia [0000-0003-2832-777X], Kehoe, Robert [0000-0002-7101-697X], Lan, Ting-Wen [0000-0001-8857-7020], Lauer, Tod R. [0000-0003-3234-7247], Le Guillou, Laurent [0000-0001-7178-8868], Lesser, Michael [0000-0002-7199-0537], Marshall, Robert [0000-0002-6880-9987], Martini, Paul [0000-0002-4279-4182], Mas des Bourboux, Hélion du [0000-0001-8955-3573], Metcalfe, Nigel [0000-0001-9034-4402], Narayan, Gautham [0000-0001-6022-0484], Newman, Jeffrey A. [0000-0001-8684-2222], Nord, Brian [0000-0001-6706-8972], Olsen, Knut [0000-0002-7134-8296], Prakash, Abhishek [0000-0003-4451-4444], Ross, Nicholas P. [0000-0003-1830-6473], Rudnick, Gregory [0000-0001-5851-1856], Safonova, Sasha [0000-0002-2240-7421], Saha, Abhijit [0000-0002-6839-4881], Schweiker, Heidi [0000-0001-9580-4869], Silva, David R. [0000-0002-7678-2155], Sien, Suk [0000-0002-5249-1353], Vivas, Kathy [0000-0003-4341-6172], Yang, Jinyi [0000-0001-5287-4242], Yang, Qian [0000-0002-6893-3742], Yapici, Tolga [0000-0002-5306-4804], Zaritsky, Dennis [0000-0002-5177-727X], Zhang, Kai [0000-0002-9808-3646], Zhang, Tianmeng [0000-0002-8531-5161], Zhou, Rongpu [0000-0001-5381-4372], Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
010504 meteorology & atmospheric sciences, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], media_common.quotation_subject, halo, FOS: Physical sciences, Surveys, 01 natural sciences, milky-way tomography, Footprint, Software, surveys, Observatory, 0103 physical sciences, QB Astronomy, redshift distributions, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, dark energy survey, STFC, QB, 0105 earth and related environmental sciences, Remote sensing, media_common, business.industry, RCUK, Astronomy and Astrophysics, cosmos, 3rd-DAS, Probabilistic inference, Galactic plane, streams, Photometry (astronomy), Space and Planetary Science, Sky, Satellite, digital sky survey, galaxy, Catalogs, Astrophysics - Instrumentation and Methods for Astrophysics, business, sdss, sextractor, catalogs, Geology, astro-ph.IM
Abstract

The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image ≈14,000 deg2 of the extragalactic sky visible from the northern hemisphere in three optical bands (g, r, and z) using telescopes at the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory. The combined survey footprint is split into two contiguous areas by the Galactic plane. The optical imaging is conducted using a unique strategy of dynamically adjusting the exposure times and pointing selection during observing that results in a survey of nearly uniform depth. In addition to calibrated images, the project is delivering a catalog, constructed by using a probabilistic inference-based approach to estimate source shapes and brightnesses. The catalog includes photometry from the grz optical bands and from four mid-infrared bands (at 3.4, 4.6, 12, and 22 μm) observed by the Wide-field Infrared Survey Explorer satellite during its full operational lifetime. The project plans two public data releases each year. All the software used to generate the catalogs is also released with the data. This paper provides an overview of the Legacy Surveys project., The BASS is also supported by the External Cooperation Program of Chinese Academy of Sciences (Grant # 114A11KYSB20160057), and Chinese National Natural Science Foundation (Grant # 11433005). The Legacy Surveys imaging of the DESI footprint is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No. DE-AC02- 05CH11231, by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; and by the U.S. National Science Foundation, Division of Astronomical Sciences under Contract No. AST-0950945 to NOAO. Travel and other support for the DECaLS and MzLS projects is provided by the National Optical Astronomy Observatory, the Lawrence Berkeley National Laboratory, and the DESI Project. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement n. 320964 (WDTracer). J. Moustakas gratefully acknowledges support from the National Science Foundation grant AST1616414. A. Dey thanks the Radcliffe Institute for Advanced Study for their generous support during the year these surveys were initiated. A. Dey, D. J. Schlegel, and D. Lang thank the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1066293, for their hospitality and support during summer 2015 during which part of this work was conducted.

Published
2019
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